clusterer issues

First off all, thank you for this excellent module. I'm using GMap and Location with a custom content type. The custom content type just has info in City and State fields, which is then automatically translated to a latitude and longitude. I'm using the latitude and longitude in Views to create a gmap node view which displays nodes on gmap - it works great.
However, my problem arises when more than one node has the same exact location (same city and state). I don't want to provide more information than city, such as street address - either because this is unknown or for privacy reasons. Poskanzer's clusterer shows a cluster on any city with multiple nodes, but when I click any part of the cluster it takes me to a zoomed-in view of the marker for the first node I created with that city and state. The other node(s) marker can't be seen anywhere (behind the first marker maybe?). Changing some settings made this clusterer display a popup box but it was very long horizontally and narrow vertically and kept making the map move back and forth left and right really quickly, and the popup box was blank (or couldn't render because it wouldn't stop moving). Using GMarkerManager results in no nodes showing at all. So far I have resorted to going into a node and altering its specific longitude and latitude by a fraction of a degree to slightly offset one node from another, but I'm not sure how well this will work or how ill be able to maintain this with 100s of nodes easily. Any ideas/recommendations/fixes would be greatly appreciated - even just discussion of these issues.
Thanks again for the work on this module, it definitely enhances my site.
-Bill